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Vishay General Semiconductor - Diodes Division VS-41HF40
- Part No.:
- VS-41HF40
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Diodes
- Package:
- DO-203AB, DO-5, Stud
- Datasheet:
-
VS-41HF40.pdf
- Description:
- DIODE GEN PURP 400V 40A DO203AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
VS-41HF40 from Vishay Semiconductors is a standard recovery power diode in stud-mount DO-5 (DO-203AB) package, rated for 40 A average forward current, 400 V maximum repetitive peak reverse voltage (VRRM), and 570 A non-repetitive surge current at 50 Hz. It features stud anode polarity, high thermal robustness (TJ up to 190 °C), and is designed for high-current industrial rectification in battery chargers and welding equipment.
For engineers reviewing the VS-41HF40 datasheet, VS-41HF40 pinout, VS-41HF40 application, or VS-41HF40 equivalent, this page delivers verified electrical ratings, thermal resistance data, mounting torque specifications, forward voltage characteristics at TJ = 25 °C and TJ max, and real-world application context for high-power AC/DC conversion systems.
Technical Context
The VS-41HF40 is a single-die, stud-anode (R-suffix) standard recovery diode optimized for line-frequency rectification with low forward slope resistance (rf = 4.29 mΩ at ≤1200 V) and controlled thermal impedance (RthJC = 0.95 K/W). Its construction supports direct heatsink mounting via threaded stud, enabling efficient conduction-angle-dependent current handling up to 180° half-sine wave.
It operates across -65 °C to +190 °C junction temperature range and exhibits defined I²t fusing limits (1600 A²s at t = 10 ms, no voltage reapplied), making it suitable for applications requiring predictable fault energy withstand without active protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse voltage the diode blocks reliably during AC line cycles. |
| IF(AV) | 40 A at TC = 140 °C - Sustained DC or half-sine average forward current with case temperature held at 140 °C. |
| IFSM (50 Hz) | 570 A - Peak one-cycle surge current capability without destructive failure under standard 50 Hz line conditions. |
| RthJC | 0.95 K/W - Thermal resistance from junction to case, critical for calculating maximum allowable ambient temperature with given heatsink RthSA. |
| VF(TO) | 0.65 V - Threshold voltage at TJ max, defining the onset of forward conduction in the exponential I–V region. |
| rf | 4.29 mΩ - Forward slope resistance at TJ max, used to compute dynamic forward drop (VF = VF(TO) + IF × rf) under load. |
| I²t (t = 10 ms) | 1600 A²s - Fusing energy limit with no voltage reapplied; determines coordination with upstream fuses or breakers. |
Pinout & Package
VS-41HF40 uses the DO-5 (DO-203AB) stud-mount metal package with isolated lead configuration ('41' code), where the anode is connected to the threaded stud and the cathode is accessible via insulated lead. Mounting requires 3.2 N·m torque on lubricated hexagon (per datasheet Doc. #93513, p.2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Threaded Base) | Anode | Primary high-current input terminal; electrically and thermally coupled to heatsink; polarity confirmed as anode-to-stud per 'R' suffix. |
| Isolated Lead (Red Sleeve) | Cathode | Insulated output terminal; red sleeve indicates reverse polarity (cathode lead); enables safe connection without stud shorting. |
Key Features
| Feature | Design Value |
|---|---|
| Stud-anode, isolated-cathode lead | Enables direct heatsink mounting while maintaining electrical isolation of cathode node-critical for floating secondary-side rectification. |
| High IFSM (570 A @ 50 Hz) | Supports inrush-tolerant operation in welder primary rectifiers and large-capacitor-input power supplies without derating. |
| Low RthJC (0.95 K/W) | Allows >40 A continuous conduction at TC ≤ 140 °C with modest heatsinking-reducing thermal interface material and heatsink mass requirements. |
| Defined I²t fusing curve | Permits precise fuse selection for coordinated overcurrent protection in industrial motor drive front-ends and battery charging stacks. |
| Extended TJ range (−65 to +190 °C) | Validates operation in harsh environments such as engine compartments, industrial ovens, and outdoor power converters. |
Applications
| Battery Chargers | Welding Power Supplies |
|---|---|
|
Use Scenario: High-current, capacitor-input rectification in 3-phase industrial battery chargers delivering 40–100 A DC output. IC Role / Device Role / Timing Role: Main AC/DC rectifier diode conducting full half-wave current at line frequency (50/60 Hz). Use Value: VS-41HF40's 40 A IF(AV) rating and 570 A IFSM ensure reliable startup into deeply discharged battery banks without thermal runaway or surge failure. |
Use Scenario: Primary-side rectification in resonant or transformer-isolated arc-welding inverters operating at 500–1000 VDC bus. IC Role / Device Role / Timing Role: Line-frequency input rectifier converting 3-phase AC to high-voltage DC bus prior to inverter stage. Use Value: With RthJC = 0.95 K/W and TJ max = 190 °C, VS-41HF40 sustains duty-cycle-intensive welding bursts without exceeding thermal limits under forced-air or liquid-cooled heatsinks. |
| Machine Tool Controls | Industrial Converters |
|
Use Scenario: DC link rectification in servo drive power modules powering CNC machine spindles and axis motors. IC Role / Device Role / Timing Role: Uncontrolled rectifier in multi-kW DC bus generation, operating continuously at 40–60 °C ambient with periodic overload. Use Value: The 4.29 mΩ forward slope resistance minimizes conduction loss (≤2.5 W at 40 A), reducing heatsink size and improving system efficiency over legacy diodes. |
Use Scenario: Input rectification in high-reliability industrial DC-DC converters for PLC backplanes and sensor networks. IC Role / Device Role / Timing Role: Standard recovery diode handling 50/60 Hz mains input with minimal EMI generation compared to fast recovery alternatives. Use Value: Controlled reverse recovery (standard, not ultrafast) avoids voltage spikes in inductive transformer-coupled inputs-enhancing EMC compliance and snubber simplicity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard recovery diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VSKY40-04 | Same 40 A IF(AV), 400 V VRRM, but TO-247AC package with isolated tab; RthJC = 1.2 K/W. | Requires insulating washer and bolted heatsink interface; less suited for direct-stud mounting in compact enclosures. | Select VSKY40-04 only when PCB-mount or insulated-tab layout constraints prohibit stud-base mechanical integration. |
| VS-40HF40 | Identical electrical specs and DO-5 package, but '40' code denotes non-isolated lead (no silicone sleeve); cathode lead exposed. | Not suitable where cathode isolation from chassis ground is required-risk of short if lead contacts enclosure. | Choose VS-40HF40 only in grounded-cathode designs with physical lead routing control; VS-41HF40 preferred for safety-critical or floating outputs. |
Compared with VSKY40-04 and VS-40HF40, the VS-41HF40 uniquely combines stud-anode polarity, red-sleeved isolated cathode lead, and 0.95 K/W RthJC-making it the optimal choice for space-constrained, high-reliability industrial rectifiers demanding both thermal performance and electrical isolation integrity.
Availability
VS-41HF40 is available at Aetrix Electronics and suitable for battery chargers, welding power supplies, machine tool controls, and industrial converters requiring stable component supply with long lifecycle support and traceable sourcing.
Supply support for VS-41HF40 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on high-reliability power and signal conditioning devices.
The VS-41HF40 belongs to Vishay's VS-40HF(R) Series of stud-mount standard recovery diodes, engineered for rugged industrial rectification where thermal stability, surge tolerance, and mechanical mounting flexibility are prioritized over ultrafast switching.
FAQ
What is the polarity configuration of the VS-41HF40?
The VS-41HF40 has stud-anode polarity (denoted by the 'R' suffix in its series name), meaning the threaded metal stud serves as the anode terminal, while the insulated red-sleeved lead is the cathode. This configuration allows direct thermal coupling of the anode to the heatsink while maintaining electrical isolation of the cathode node-essential for floating secondary-side rectification in isolated power supplies.
What does the '41' in VS-41HF40 indicate?
The '41' code specifies the lead configuration: '41' means non-isolated stud base with isolated cathode lead (red silicone sleeve), distinguishing it from '40' (non-isolated lead) and '42' (isolated lead with silicone sleeve and polarity marking). For VS-41HF40, this ensures the cathode remains electrically isolated from the mounting surface, preventing inadvertent shorts in chassis-grounded systems.
What is the maximum mounting torque for the VS-41HF40 stud?
The maximum recommended mounting torque for the VS-41HF40's 1/4"-28UNF-2A stud is 3.2 N·m (28 lbf·in) when using a lubricated thread and tightening on the hexagon, per Vishay Document #93513. Exceeding this torque risks damaging the internal bond or deforming the case seal, potentially compromising hermeticity and thermal performance.
How does the VS-41HF40's thermal resistance compare to similar stud diodes?
The VS-41HF40 has a junction-to-case thermal resistance (RthJC) of 0.95 K/W, which is lower than many TO-247 or TO-220 packaged 40 A diodes (typically 1.2–1.8 K/W). This 25–50% improvement enables higher sustained current at the same case temperature or reduced heatsink size-particularly valuable in space-constrained industrial enclosures where airflow is limited.
Can the VS-41HF40 be used in 60 Hz applications?
Yes, the VS-41HF40 is fully rated for 60 Hz operation: its IFSM is specified at 595 A for 60 Hz (t = 8.3 ms), and all thermal derating curves in the datasheet include 60 Hz conduction period data. Its standard recovery behavior is well-suited for line-frequency rectification in North American and Japanese power systems without requiring snubber networks.
VS-41HF40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-203AB, DO-5, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 40A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 125 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 9 mA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis, Stud Mount
- Supplier Device Package:
- DO-203AB (DO-5)
- Operating Temperature - Junction:
- -65°C ~ 190°C
VS-41HF40 FAQ
1.How can I place an order for VS-41HF40 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-41HF40 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VS-41HF40 reliable?
The price and inventory of VS-41HF40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-41HF40 is usually 5 days.
3.What payment methods are accepted for VS-41HF40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-41HF40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-41HF40?
VS-41HF40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-41HF40 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VS-41HF40?
For technical support, including VS-41HF40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-41HF40 requirements.
6.How does Aetrix verify that VS-41HF40 is sourced from the original manufacturer or authorized distributors?
All VS-41HF40 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VS-41HF40 meets industry standards.
7.What is the process for return or replacement of VS-41HF40?
All VS-41HF40 units undergo pre-shipment inspection (PSI). If there is an issue with VS-41HF40, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VS-41HF40 part is unused and in its original packaging.
Return procedure for VS-41HF40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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